CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Turn inlet and outlet to boundary condition

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 28, 2018, 06:45
Default Turn inlet and outlet to boundary condition
  #1
New Member
 
Maria
Join Date: Apr 2018
Posts: 4
Rep Power: 5
matos is on a distinguished road
Hello,
I am using a reactor which was initially simulated, in transient state, with two inlets (at the bottom) and and two outlets (at the top). Now that the dynamic behaviour of the fluids inside the reactor is stabilized, I want to transform the inlets (inlet 1 and 2) and outlets (outlet 1 and 2) into a boundary condition, i.e., what goes out through inlet 1 will reenter in inlet 1 and the same for inlet and outlet 2.
I transformed the inlet 1 and outlet 1 into walls (81 and 113) and tryied to use the manual boundary condition comands:

/mesh/modify-zones> make-periodic
Periodic zone [()] 81
Shadow zone [()] 113
Rotational periodic? (if no, translational) [yes] yes
Create periodic zones? [yes] yes

But I get this error:

Error: Failed to make zones periodic.
Error Object: #f

Am I doing something wrong or it is not possible to do this ?
Thank you in advance,
Joana Matos.
matos is offline   Reply With Quote

Old   December 30, 2018, 15:12
Default
  #2
Senior Member
 
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 4,122
Rep Power: 50
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Why did you answer yes to rotational? That's your problem.

Note that for the periodic pair creation to be successful the grid needs to be conformal at the boundaries. Otherwise you need to create a periodic interface.
LuckyTran is offline   Reply With Quote

Old   December 30, 2018, 15:20
Default
  #3
New Member
 
Maria
Join Date: Apr 2018
Posts: 4
Rep Power: 5
matos is on a distinguished road
Thank you. Actually I tried both rotational and translational. I changed the mesh so it is conformal and the perioidc boundaries, with translational, are done. I'm having convergence problems now: "floating point". I tried several methods, but could not solve the problem...
matos is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Issues on the simulation of high-speed compressible flow within turbomachinery dowlee OpenFOAM Running, Solving & CFD 9 February 5, 2021 10:15
How to unserstand Correct boundary condition at outlet for incompressible flow? aja1345 FLUENT 3 July 16, 2018 12:12
map outlet boundary profile as an inlet condition using UDF Daniel_Khazaei Fluent UDF and Scheme Programming 2 June 20, 2016 11:53
boundary condition for coupled inlet and outlet xxxx OpenFOAM Pre-Processing 2 August 13, 2013 15:51
inlet and outlet boundary condition of pump Thammasak CFX 0 February 9, 2004 13:02


All times are GMT -4. The time now is 21:10.